<!DOCTYPE html>
<html lang="zh">
<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Document</title>
	<style>
		rem
		em
		.box{
			background: red;
			width:100%;
			height:100px;
			display:flex;
			justify-content: space-around;
			align-items: center;
			/* flex-wrap: wrap-reverse;
			flex-direction: row; */
			
		}
		.list1{
			box-sizing: border-box;
			padding: 10px;
		}
/* 		.lis1{
			flex: 1;
		}
		.lis2{
			flex: 1;
		}
		.lis3{
			flex: 1;
		} */
	</style>
</head>
<body>
	<div class="box">
		<div class="list1">1</div>
		<div class="lis">1</div>
		<div class="lis">1</div>
		<div class="lis">1</div>
	</div>
</body>
</html>